k....
so i guess ill try to look into the lighting stuff, but im not 100% sure its that tho because if there was no lighting then my plane should be black as thats the original color i gave it...
Normals for water simulation
ah, my brain has just worken up [grin]
You draw the reflection with a white background, yes?
Thus, when you project the texture you are projecting a white texture onto the plane which will vanish into the background.
Just to give you a hint on the shaders, the ones i'm using are
(projCoord is the same as using the multi-texture coord thing you use)
It could be adjusted to use glLighting later, but as a proof of concept it works well [smile]
You draw the reflection with a white background, yes?
Thus, when you project the texture you are projecting a white texture onto the plane which will vanish into the background.
Just to give you a hint on the shaders, the ones i'm using are
// vertex programvarying vec4 projCoord;void main(){ vec3 lightVect, trueNormal; vec4 realPos = gl_ModelViewMatrix * gl_Vertex; lightVect = normalize(gl_LightSource[0].position.xyz - realPos.xyz); trueNormal = gl_NormalMatrix * gl_Normal; projCoord = gl_TextureMatrix[0] * gl_Vertex; gl_FrontColor = vec4(dot(lightVect, trueNormal) - 0.1); gl_Position = ftransform();}// fragment programuniform sampler2D reflectTex;varying vec4 projCoord;const vec4 ambient = vec4(0.13), boost = vec4(1.06);void main(){ vec4 reflectionValue = texture2DProj(reflectTex, projCoord); gl_FragColor = boost * gl_Color * reflectionValue + ambient;}(projCoord is the same as using the multi-texture coord thing you use)
It could be adjusted to use glLighting later, but as a proof of concept it works well [smile]
Author
ahh yeah....so i guess i have to set some sort of blending on my projection....
well, i've got some work ahead :)
tks a LOT for your help...
also to calculate the normals i've used the technique on the site given by gamelife
N = Vector3D(z[x-1][y] - z[x+1][y], z[x][y-1] - z[x][y+1], 2);
N.Normalize();
so far it seems to work ok, so now i guess i just have to work a bit more on my shaders and implement a few things concerning lighting and colors.
ill keep ya posted :)
tks again
well, i've got some work ahead :)
tks a LOT for your help...
also to calculate the normals i've used the technique on the site given by gamelife
N = Vector3D(z[x-1][y] - z[x+1][y], z[x][y-1] - z[x][y+1], 2);
N.Normalize();
so far it seems to work ok, so now i guess i just have to work a bit more on my shaders and implement a few things concerning lighting and colors.
ill keep ya posted :)
tks again
Author
ok....i calculated the normals and everything but....shouldn't the surface be all smooth now when i disburb it??
http://pallots.kicks-ass.net/planarreflect/disturb.jpg
and you can see better here without any reflections:
http://pallots.kicks-ass.net/planarreflect/disturb2.jpg
there you can see a bit what it looks like... whatever disturbance i do i still see all the square facets and afaik with a normal for every vertex i shouldn't....
also im wondering if anyone had or could tell me where i could get just a small surrounding (like a terrain) on which i could put my water to really see if the reflections are right...
http://pallots.kicks-ass.net/planarreflect/disturb.jpg
and you can see better here without any reflections:
http://pallots.kicks-ass.net/planarreflect/disturb2.jpg
there you can see a bit what it looks like... whatever disturbance i do i still see all the square facets and afaik with a normal for every vertex i shouldn't....
also im wondering if anyone had or could tell me where i could get just a small surrounding (like a terrain) on which i could put my water to really see if the reflections are right...
Author
OK i fixed it, it was indeed the normals, here's what it looks like now:
http://pallots.kicks-ass.net/planarreflect/disturb5.jpg
compared to
http://pallots.kicks-ass.net/planarreflect/disturb4.jpg
:D
[Edited by - tasseloff on December 5, 2004 10:37:44 PM]
http://pallots.kicks-ass.net/planarreflect/disturb5.jpg
compared to
http://pallots.kicks-ass.net/planarreflect/disturb4.jpg
:D
[Edited by - tasseloff on December 5, 2004 10:37:44 PM]
Author
hi, i know this is my old thread but, didn't want to start a new one for nothing.....
right now, im using the calculation given on the link above to calculate normals.....basically its
normalize(height[x-1,y] - height[x+1,y], height[x,y-1] - height[x,y+1], 2)
however...id like to know where that comes from.....it seems to be a common way to calculate normals on a heightfield but im just wondering what's the math behind all that...
right now, im using the calculation given on the link above to calculate normals.....basically its
normalize(height[x-1,y] - height[x+1,y], height[x,y-1] - height[x,y+1], 2)
however...id like to know where that comes from.....it seems to be a common way to calculate normals on a heightfield but im just wondering what's the math behind all that...
the math term for that equation is finite difference. It's a way to compute the derivative of a discrete data field. Geometrically speaking, it approximates the 2D tangential plane over each texel. The surface normal of that plane is the normal of the height field texel.
Author
ahh, tks a lot Yann :)
hope your trip went well
finally i was able to get my simulation based on the Obrien paper to work, even tho the code you gave in your lecture seemed more efficient there's a few things i wasn't sure about so i just didn't use it
tks for the reply
hope your trip went well
finally i was able to get my simulation based on the Obrien paper to work, even tho the code you gave in your lecture seemed more efficient there's a few things i wasn't sure about so i just didn't use it
tks for the reply
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